Field



(No Model.) 2 Sheets-Sheet 1.

w. c. WINFIELD & J. F. MoNUTT. MACHINE FOR FORMING CORRUGATED ELBOWPIPES.

No. 520,870. PatentedJune 5,1894.-

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W. 0. WINPIELD & J. F. McNUTT. MACHINE FOR FORMING GORRUGATED ELBOWPIPES.

No. 520,870. Patented June 5, 1894.

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sj ii Wilham C. in ie. BY W 5mm T. n mu ATTORNEY.

UNITED STATES PATENT OFF CE.

WILLIAM G. WINFIELD AND JOHN F. MONUTT, OF WARREN, OHIO, ASSIGN- ORS TOTHE WINFIELD MANUFACTURING COMPANY, OF SAME PLACE.

MACHINE FOR FORMING CORRUGATED ELBOW-PIPES.

SPECIFICATION forming part of Letters men; No. 520,870, datedd'une5,1894.

Application filed July 12,1893. SerialNo.480,249. (NomodeL) To aZZ whomit may concern/.

Be it known that we, WILLIAMJ. WIN- FIELD and JOHN F. MONUTT, citizensof the United States, residing at Warren, 'in the county of Trumbull andState of Ohio, have invented certain new and useful Improvements inMachines for Forming Corrugated Elbow-Pipes; and we do hereby declarethat the following is a full, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the same.

Our invention relates to a machine for forming corrugated pipe elbows,and the invention consists in the construction and combination of partssubstantially as shown and described and particularly pointed out in theclaims.

In the accompanying drawings, Figure 1 is a perspective front elevationof the machine with all the parts in position to receive the pipe to bebent. Fig. 2 is a plan view of the machine with the parts in full linesoccupying the position seen in Fig. 1, and with the parts in dottedlines as they appear when a tube is clamped and bent, the upper supportand corrugation-clamping sections being re moved in this view. Fig. 3 isan elevation of the face of the left hand clamp and mandrel and thesupport for said parts. Fig. 4 is a view looking in from the right ofFig. 5 and showinga side elevation of one of the corrugation clampingsections and an end view of the support therefor, and the means by whichsaid section is attached to the support. Fig. 5 is a plan view of one of.the corrugationclamping section supports having a full series of saidsections affixed thereto and shown in their normal position. Fig. 6 is aplan view of the parts shown in Fig. 5 with the corrugation-clampingsections at the right removed and showing the remaining sections broughttogether at their points to illustrate their position and relation toone another when bending of the pipe occurs. Fig. 7 is an elevation ofan elbow which has been formed by the machine herein described.

It will be understood that if only a slight bend is wanted a fewernumber of corrugation or forming sections will be used, but if a fullright angle bend be wanted and the pipe is comparatively large, therewould probably be twelve or fifteen or more of said sec tions. employed.As many may be used as the Work requires. p

A represents a flat rectangular bed plate upon which is mounted theupright guidepost H, rigid with the rear of ,the said bed plate andserving more especially as a, support and guide for the oppositelymoving supports I, I, which carry the clamping sections B. Thesesupports I, I are intended to move freely toward and from one anotherand to move in unison, and to this end are connected by links J to theends of the crank arm K, rigidly affixed to a spindle passing throughthe post 11 and provided with a handle L. It will be noticed,however,that the lower link J has its pivot point nearer to the spindle L of thecrank than the upper link J so that when the said crank is turned theupper support I will travel farther than the lower support 1.

Upon the base A are pivoted at Q, Q, Fig. 2, the swinging beams orlevers B and G, which are provided respectively with handles X and Y attheir ends. The mandrels G are mounted on the swinging beams by means ofthe brackets E and D, to which the mandrels or cores G are rigidlyailixed. These mandrels or cores are slightly bent, as clearly seen inFig. 2, and have their free inner ends beveled so as to adapt the partsto bend the pipe andat the same time support it all around as willhereinafter more clearly appear. The bracket D is adjustable back andforth upon the beam or lever C and is secured in any given placev ofadjustment by means of the set screw U, and is moved only to adapt thebracket to difierent lengths of pipe, some pipes having a length beyondthe corrugation greater than others. The bracket E likewise is supportedupon its beam B to be moved back and forth in respect to the oppositebracket and mandrel, and is controlled by means of a crank lever V and alink S so as to be readily moved or adjusted when it is desired toinsert a pipe section or to remove the same after it has been bent.

The clamps F and F are formed in two sections, each having a commonpivot P and encircling the mandrels or cores G about their base, and areadapted to be opened when a pipe is introduced, and then to be clampedupon the pipe to firmly hold the same or bend it, after which they areagain opened to remove the pipe and insert another. As a means ofopening and closing said clamps, we have here shown a link N, Fig. 3,secured to one of said clamping sections near its middle length and acrank handle M with an eccentric O passing through the other section ofthe clamp and the said link. Hence, when the said handle is turned inone direction, it will open the clamps, and when turned in the otherdirection, it will firmly close them upon the pipe and mandrel. Theconstruction of the two clamps F and F is alike, and the parts thereofare designated by like letters. Immediately back of said clamps at thebase of the cores or mandrels are shoulders or collars -U-- which serveas buttons or stops for the pipe, and when the pipe is placed inposition its ends abut against these collars and the clamps F and F arethen fastened thereon and the parts are in position to be turned to bendthe pipe.

To encircle the pipe and fit in the corrugations thereof, which havebeen previously made, for the purpose of controlling the formation ofthe same in the process of bending, we provide the tapering segmentalcorrugation clamping sections B. These sections are arranged in two setswhich come at opposite sides of the corrugated portion of the pipe andare designed to meet in the throat of the pipe. It will be noticed thatthey are not 3 5 only separate from one another or formed in separatepieces, but that they taper along both sides from base to point, theexact construction thereof being disclosed clearly in Figs. 4 and 5,Fig. 4 showing a side view and Fig. 5 an edge view with the said clampsseparated at their points and in position to enter the corrugations ofthe pipe when the pipe is placed in the machine. Each series or set ofsaid sections R is attached to its support I or I, and the constructionof these supports and the parts connecting the said sections thereto issubstantially alike in all particulars. Each section is attached to itssupport by means of a screwa, which passes through the support into thesection, and the screw serving also as a pivot point. In order that thesaid sections B may assume the proper position to adapt them to thecorrugations in the throat of the pipe when the bending occurs, it isnccessary that they should be so attached to their supports as to bemovable toward a given center at their reduced ends, the relationorposition which they take when this occurs being shown in Fig. 6. Hencewe have formed slots or openings clthrough the supports I and I, whichsaid slots are made longest on the outside and are short ened toward thecenter in proportion to the distance the respective sections B have tomove in order to assume the position corre sponding to that in Fig. 6.The screws a are inserted through these slots and the parts are not sofirmly fastened but that the sections B have freedom to move back andforth. The middle section B of each set is fastened by a dowel pin -e orits equivalent so as to be rigid upon its support and the other sectionsmove to and from it on the sides. In order that the said sections mayall be thrown back into their normal position after use, we connect theend sections by means of a spiral spring -c-, or its equivalent, whichoperates to spread the sections, as seen in Fig. 5, and then in order tokeep said sections properly aligned we employ a flexible strip -f whichis affixed to the shoulders of the sections by means of a small screw b.Obviously, any equivalent means for maintaining alignment and to keepthe said sections in the relation shown in Fig. 5 may be adopted. As themiddle section R of each set is rigid, when the parallel portion at theheel of each section is brought in line with the adjoining section bymeans of the spring c--, all the sections must necessarily bein line andproper position.

To get the proper bending or closing in the inside or throat of theelbow without subjecting the tapering side or seam to any pull orstretch due to such closing or bending of the pipe, the mandrels and theclamps F and F are mounted upon swinging beams which are pivoted at sucha point as will control the positions of the ends of the elbow andinsure a proper position throughout the entire process of bending; thatis, taking the points --ac, 0cand m-, a:' and the points -y-, yand y',y'- at either end of the corrugated portion, the points -a'-, --yand-ac,-y at the two sides would designate the position of the pointsbefore bending, while during the process of bending these points wouldfollow their respective curves, shown by the dotted lines, until theyarrive at the positions of full bending, indicated in this instance bym, -y-- and -w, -y-. These points being considered in their relation tothe prime center -w of the curve of the elbow are found to assume acorrect position and to have described arcs whose centers are commonwith the centers of pivots Q, Q of the beams B and G, which likewisehave been moved in bending, as seen by dotted lines Fig. 2. A stillgreater angle of bending may be given to the pipe than that hereindicated,but the operation in any case, whether the bending be greateror less, will be the same as described.

To insure concerted action of the beams or levers l3 and 0 they areprovided with hubs or their equivalents at or about their pivots onwhich are teeth -q-- adapted to mesh together and thus cause the saidbeams to move in unison. The inner ends of the cores or mandrels G areso arranged in respect to one another as to extend into the pipe to nearthe center thereof, and their curvature or bonding is such ascorresponds to the shape of the elbow when bent, the product ICC of themachine and the result of its operation being illustrated in Fig. 7.

The operation is as follows: The clamp F is opened by turning the handleM and its eccentric O a half revolution backward, when the mandrel isfree to slip the pipe over against the shoulder 'v-, and the left handclamp is closed by reverse movement of the lever M and the pipe isfastened at that end. Then the right hand mandrel and clamp are movedback to introduce the other end of the pipe over this mandrel and tofasten the clamp F thereon. This being done' the handle lever L whichcontrols the two supports I and I and their corrugation clampingsections is given a half revolution to the right which throws the crankK and the connections or links J into a closed position and brings theclamping sections down into the corrugations of the pipe and holds themfirmly therein for the further operation of bending. The handles X and Yupon the beams or levers B and O are then grasped and the said beams areswung upon their pivots Q into the position shown, for example, indotted lines in Fig. 2, and in this operation compressing the corrugatedportion of the pipe especially in the throat thereof and imparting tothe pipe the desired bend. All this is the work of but a few moments,and when the bending is effected the clamping sections are withdrawn byturning the lever L, the right hand clamp F" is opened and the bracket'E withdrawn and the left hand clamp F is opened and the finished elbowremoved.

Having thus described ourinvention, what we claim as new, and desire tosecure by Letters Patent, is V 1. A machine for bending corrugated pipe,comprising two cores or mandrels upon which the pipe to be bent isplaced, saidmandrels mounted upon separate swinging beams or levers, theadjustable clamping sections adapted to engage the corrugations of thepipe, the oppositely moving supports for the same and means to operatesaid supports, substantially as set forth.

2. Amachine for bending corrugated pipe, comprising two cores ormandrels upon which the pipe to be bent is placed, said mandrelsmount-ed upon and swinging with pivoted beams or levers havingindependent pivots or centers and moving in unison, the adjustableclamping sections adapted to engage the corrugations of the pipe, andthe oppositely moving supports for the same, substantially as set forth.

3. In the machine described, the oombina tion of the two cores ormandrels upon which the pipe to be bent is placed, with the swingingbeams or levers carrying said mandrels one beam driving the other andhaving 'indepengent pivots or centers, substantially as set ort 4. Thecombination of the mandrels upon which the pipe is to be bent, with thesupports for said mandrels adjustable on the swinging beams or leverscarrying said supports and mandrels and one beam driving the other,substantially as set forth.

5. In combination with the mandrels, the

two independently pivoted beams carrying the mandrels and having gearsat their hubs about their pivots meshing together and serving to causesaid beams to move in unison, substantially as set forth.

, 6. The combination of the cores or mandrels with the clamps encirclingsaid mandrels for holding the tube, and eccentrics and links for openingand closing said clamps, substantially as set forth. I

7. The combination of the corrugationclamping sections, the supports forthe same having a groove adapted to move upon a slide in oppositedirections and means for operating said supports, substantially as setforth.

8. The corrugation-clamping sections, in combination with theoppositely'moving supports therefor, said supports having grooveopenings in their faces through which the clamping sections areindependently and movably attached thereto, substantially as set forth.

9. The oppositely moving supports having openings 7 through which thecorrugationclamping sections are attached, in combina-' tion with aseries of clamping sections, one of said sections being rigid with itssupport and the others movable on said support, substantially as setforth.

Witness our hands to the foregoing specification.

"WILLIAM 0. WIN FIELD. JOHN F. MONUTT.

Witnesses:

O. D. GARLIsLE, W. F. LANE.

